Extern in .cpp files is a code smell.

core/src/fxge/fontdata/chromefontdata/chromefontdata.h

Index: core/src/fxge/fontdata/chromefontdata/chromefontdata.h
diff --git a/core/src/fxge/fontdata/chromefontdata/chromefontdata.h b/core/src/fxge/fontdata/chromefontdata/chromefontdata.h
new file mode 100644
index 0000000000000000000000000000000000000000..9b640568e5a855628f259434bd5f5d4f39173b97
--- /dev/null
+++ b/core/src/fxge/fontdata/chromefontdata/chromefontdata.h
@@ -0,0 +1,35 @@
+// Copyright 2015 PDFium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+// Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com
+
+#ifndef CORE_SRC_FXGE_FONTDATA_CHROMEFONTDATA_CHROMEFONTDATA_H_
+#define CORE_SRC_FXGE_FONTDATA_CHROMEFONTDATA_CHROMEFONTDATA_H_
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+extern const unsigned char g_FoxitFixedItalicFontData[18746];
+extern const unsigned char g_FoxitFixedFontData[17597];
+extern const unsigned char g_FoxitSansItalicFontData[16339];
+extern const unsigned char g_FoxitSansFontData[15025];
+extern const unsigned char g_FoxitSerifItalicFontData[21227];
+extern const unsigned char g_FoxitSerifFontData[19469];
+extern const unsigned char g_FoxitFixedBoldItalicFontData[19151];
+extern const unsigned char g_FoxitFixedBoldFontData[18055];
+extern const unsigned char g_FoxitSansBoldItalicFontData[16418];
+extern const unsigned char g_FoxitSansBoldFontData[16344];
+extern const unsigned char g_FoxitSerifBoldItalicFontData[20733];
+extern const unsigned char g_FoxitSerifBoldFontData[19395];
+extern const unsigned char g_FoxitSymbolFontData[16729];
+extern const unsigned char g_FoxitDingbatsFontData[29513];
+extern const unsigned char g_FoxitSerifMMFontData[113417];
+extern const unsigned char g_FoxitSansMMFontData[66919];
+
+#ifdef __cplusplus
+}  // extern "C"
+#endif
+
+#endif  // CORE_SRC_FXGE_FONTDATA_CHROMEFONTDATA_CHROMEFONTDATA_H_